CN116399577A - Torsion shaft fatigue test device and test method - Google Patents
Torsion shaft fatigue test device and test method Download PDFInfo
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- CN116399577A CN116399577A CN202310664244.9A CN202310664244A CN116399577A CN 116399577 A CN116399577 A CN 116399577A CN 202310664244 A CN202310664244 A CN 202310664244A CN 116399577 A CN116399577 A CN 116399577A
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 45
- 238000010998 test method Methods 0.000 title description 2
- 239000003921 oil Substances 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 22
- 239000010720 hydraulic oil Substances 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 6
- 239000010727 cylinder oil Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000005426 magnetic field effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention discloses a torsion shaft fatigue testing device and a testing method, and relates to the technical field of torsion shaft fatigue testing, wherein the torsion shaft fatigue testing device comprises a bracket, a hydraulic cylinder, a hydraulic control system, a connecting piece and a magnetic field auxiliary device, wherein the bracket is used for supporting a torsion shaft, two ends of the torsion shaft are respectively a fixed end and a torsion end, the fixed end is fixed on the bracket, and the torsion end can be rotatably arranged on the bracket around the axis of the torsion end; the hydraulic cylinder is used for providing torsion torque for the torsion shaft; the hydraulic control system controls the hydraulic cylinder to work; one end of the connecting piece is rotationally connected with the torsion end, the other end of the connecting piece is rotationally connected with the free end of the hydraulic cylinder, and the hydraulic cylinder drives the torsion end to reciprocally twist through the connecting piece; the magnetic field assist device is capable of magnetizing the torsion shaft during pre-twisting. The scheme disclosed by the invention is convenient for carrying out long-time fatigue test on the torsion shaft.
Description
Technical Field
The invention relates to the technical field of torsion shaft fatigue test, in particular to a torsion shaft fatigue test device and a torsion shaft fatigue test method.
Background
The torsion shaft of the special vehicle is a weight-closing part of the suspension system. The special vehicle enables the torsion shaft to bear the alternating cyclic torsion load effect for a long time in the traveling process of a rugged road, the surface of the torsion shaft material is easy to generate unrecoverable plastic deformation, the surface layer or the subsurface layer of the material is subjected to microcracking, and finally fatigue fracture occurs, so that the fatigue life of the torsion shaft is influenced, and immeasurable loss is caused to the whole special vehicle.
The torsion shaft manufacturing process is complex, particularly the life prediction with a high period is a technical problem, the cost of the fatigue life detection time is high on a special vehicle, and the fatigue life of the torsion shaft after multi-process processing can be predicted through a special fatigue testing device.
Therefore, a dedicated fatigue testing device is needed to predict the fatigue life of the torsion shaft after multi-process processing.
Disclosure of Invention
The invention aims to provide a torsion shaft fatigue test device and a torsion shaft fatigue test method, which are used for solving the problems in the prior art, facilitating long-time fatigue test on the torsion shaft, realizing a hysteresis expansion pre-torsion process, realizing stable and rapid plastic deformation, generating hysteresis expansion effect and generating more stable residual angle.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a torsion shaft fatigue testing device, comprising:
the support is used for supporting the torsion shaft, two ends of the torsion shaft are respectively a fixed end and a torsion end, the fixed end is fixed on the support, and the torsion end can be rotatably arranged on the support around the axis of the support;
a hydraulic cylinder for providing a torsion torque to the torsion shaft;
the hydraulic control system is used for controlling the hydraulic cylinder to work;
one end of the connecting piece is rotationally connected with the torsion end, the other end of the connecting piece is rotationally connected with the free end of the hydraulic cylinder, and the hydraulic cylinder drives the torsion end to reciprocally twist through the connecting piece;
and a magnetic field assist device capable of hysteresis-stretching the torsion shaft during pre-twisting.
Preferably, the bracket is used for supporting two torsion shafts, the free ends of the hydraulic cylinders are respectively connected with the two torsion shafts through two connecting pieces, the two torsion shafts are symmetrically arranged about a first plane, and the two connecting pieces are also symmetrically arranged about the first plane; when the push rod of the hydraulic cylinder is in an initial state, the free end of the push rod is lower than the torsion shaft, and an included angle exists between the connecting piece and the vertical direction;
in the process of extending the push rod of the hydraulic cylinder, the included angle between the connecting piece and the vertical direction gradually becomes larger until the connecting piece is in a horizontal state, and the two connecting pieces are hinged to the free ends of the push rod in a structure propping connection.
Preferably, the hydraulic control system further comprises a position sensor, a pressure sensor and a PLC control system, wherein the position sensor is used for detecting the position of the free end of the hydraulic cylinder and transmitting the position to the PLC control system;
the pressure sensor is used for detecting the oil pressure of a rodless cavity in the hydraulic cylinder and transmitting the oil pressure to the PLC control system;
the PLC control system controls the hydraulic control system to work.
Preferably, the magnetic field assisting device is a magnetic induction coil device, and the magnetic induction coil surrounds the outer side of the torsion shaft.
Preferably, the fixed end is sleeved with a first spline housing, and the first spline housing is fixed on the bracket;
the torsion end is sleeved with a second spline housing, and the second spline housing is rotatably arranged on the bracket through a bearing; the outer end of the second spline housing extends out of the bearing, an extending section of the second spline housing is provided with an external spline, a third spline housing is sleeved outside the extending section of the second spline housing, a shaft collar is fixedly arranged on one side of the outer wall of the third spline housing, and the third spline housing is in rotary connection with the connecting piece through a pin shaft and the shaft collar.
Preferably, the second spline housing and the third spline housing are provided with end covers on outer wall covers, and the end covers are fixedly connected with the second spline housing and the third spline housing through a plurality of screws.
Preferably, two support rods are respectively arranged on two sides of the hydraulic cylinder, and the support rods are located right below the connecting piece.
Preferably, the hydraulic control system comprises a three-position four-way valve, a directional hydraulic motor and an oil tank, wherein the oil tank is communicated with an oil inlet of the three-position four-way valve through a first pipeline, the directional hydraulic motor is arranged on the first pipeline, an oil return port of the three-position four-way valve is communicated with the oil tank through a second pipeline, and an overflow valve is arranged on the second pipeline; the two oil cylinder oil inlet and outlet ports of the three-position four-way valve are respectively communicated with a rod cavity and a rodless cavity of the hydraulic cylinder through a third pipeline and a fourth pipeline, the fourth pipeline is provided with a one-way valve, the rodless cavity is communicated with an oil tank through a fifth pipeline, the fifth pipeline is provided with a hydraulic control one-way valve, and the hydraulic control one-way valve is communicated with the third pipeline through a control oil way; the fourth pipeline is also communicated with an energy accumulator;
when the three-position four-way valve works at the left position, the directional hydraulic motor is started, the rodless cavity pushes the push rod to move upwards under the pressure action, the one-way valve is opened, and the hydraulic control one-way valve is closed;
when the three-position four-way valve works in the middle position, the directional hydraulic motor is started, hydraulic oil is also injected into the hydraulic cylinder, the energy accumulator plays a role in maintaining pressure, and redundant hydraulic oil flows back to the oil tank through the overflow valve;
when the three-position four-way valve works at the right position, the directional hydraulic motor is started, the rod cavity of the hydraulic cylinder pushes the push rod to move downwards under the action of pressure, the hydraulic control one-way valve is opened, and the one-way valve is closed.
Preferably, the connecting piece is a sliding cylinder.
The invention also provides a torsion shaft fatigue test method, which adopts the torsion shaft fatigue test device to test, and comprises the following steps:
step one, pre-twisting a torsion shaft;
and step two, taking down the pre-twisted torsion shaft, reinstalling the pre-twisted torsion shaft so that the torsion shaft with the residual angle is placed at the initial position, and repeating the fatigue test until the torsion is broken.
Compared with the prior art, the invention has the following technical effects:
the torsion shaft fatigue testing device provided by the invention controls the hydraulic cylinder to drive the torsion shaft to twist through the hydraulic control system, and the twisting process is stable and firm.
Further, both torsion shafts can be twisted at one time.
Furthermore, the hysteresis expansion pre-twisting process can be realized, stable and rapid plastic deformation is realized, hysteresis expansion effect occurs, and a more stable residual angle is generated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a torsion shaft fatigue testing device according to a first embodiment;
FIG. 2 is a schematic diagram of a hydraulic control system;
FIG. 3 is a schematic diagram of the principle analysis of torsion angle of the torsion shaft;
FIG. 4 is a vector diagram of a magnetic field finite element analysis;
in the figure: 1-a bracket; 2-torsion shaft; 3-a magnetic induction coil; 4-bearing; 5-a third spline housing; 6-a second spline housing; 7-a collar; 8-a pin shaft; 9-a connector; 10-position sensor; 11-a hydraulic cylinder; 12-a pressure sensor; 13-supporting rods; 14-a hydraulic control system; 15-a PLC control system; 16-end caps; 17-time timer; 18-a magnetic inductor power supply; 19-a first spline housing; 20-an electromagnetic switch; 21-a hydraulically-controlled one-way valve; 22-three-position four-way valve; 23-throttle valve; 24-a pressure reducing valve; 25-overflow valve; 26-a one-way valve; a 27-accumulator; 28-directional hydraulic motor; 29-shut-off valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a torsion shaft fatigue test device and a torsion shaft fatigue test method, which are used for solving the problems in the prior art and facilitating long-time fatigue test of a torsion shaft.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
The present embodiment provides a torsion shaft fatigue testing device, as shown in fig. 1, including:
the support 1 plays a bearing role, the support 1 is used for supporting the torsion shaft 2, two ends of the torsion shaft 2 are respectively a fixed end and a torsion end, the fixed end is fixed on the support 1, and the torsion end can be rotatably arranged on the support 1 around the axis of the torsion end;
a hydraulic cylinder 11 for providing a torsion torque to the torsion shaft 2;
the hydraulic control system 14 controls the hydraulic cylinder 11 to work;
the connecting piece 9, one end of the connecting piece 9 is rotationally connected with the torsion end, the other end of the connecting piece 9 is rotationally connected with the free end of the hydraulic cylinder 11, and the hydraulic cylinder 11 drives the torsion end to reciprocally twist through the connecting piece 9;
a magnetic field assist device capable of hysteresis-stretching the torsion shaft 2 during pre-twisting.
As shown in fig. 2, the hydraulic control system 14 includes a three-position four-way valve 22, a directional hydraulic motor 28 and an oil tank, the oil tank is communicated with an oil inlet of the three-position four-way valve 22 through a first pipeline, the directional hydraulic motor 28 is arranged on the first pipeline, an oil return port of the three-position four-way valve 22 is communicated with the oil tank through a second pipeline, and an overflow valve is arranged on the second pipeline; the two oil cylinder oil inlet and outlet ports of the three-position four-way valve 22 are respectively communicated with a rod cavity and a rodless cavity of the hydraulic cylinder 11 through a third pipeline and a fourth pipeline, the fourth pipeline is provided with a one-way valve 26, the rodless cavity is communicated with an oil tank through a fifth pipeline, the fifth pipeline is provided with a hydraulic control one-way valve 21, and the hydraulic control one-way valve 21 is communicated with the third pipeline through a control oil way; the fourth pipeline is also communicated with an accumulator 27;
when the three-position four-way valve 22 works in the left position, the directional hydraulic motor 28 is started, the rodless cavity pushes the push rod to move upwards under the pressure effect, the one-way valve 26 is opened, and the hydraulic control one-way valve 21 is closed;
when the three-position four-way valve 22 works in the middle position, the directional hydraulic motor 28 is started, hydraulic oil is also injected into the hydraulic cylinder 11, the accumulator 27 plays a role in maintaining pressure, and redundant hydraulic oil flows back to the oil tank through the overflow valve;
when the push rod reaches the top position, a dwell-protecting motion can be achieved in combination with the accumulator 27 as needed, so that the rodless cavity pressure is constant. When the hydraulic cylinder 11 is overloaded or the torsion shaft 2 is twisted off, the pressure sensor 12 below the hydraulic cylinder 11 detects an abnormality, so that the stop valve 29 is started, and the hydraulic control system 14 rapidly discharges oil, thereby playing a role of automatic stopping and self-protection.
When the three-position four-way valve 22 works in the right position, the directional hydraulic motor 28 is started, the rod cavity of the hydraulic cylinder 11 pushes the push rod to move downwards under the pressure effect, the hydraulic control one-way valve 21 is opened, and the one-way valve 26 is closed.
The three-position four-way valve 22 is controlled by the electromagnetic switch 20 controlled by the PLC control system 15, and the PLC control system 15 controls the electromagnetic switch 20 to work at the left position when the contact I is arranged on the electromagnetic switch 20; when the PLC control system 15 controls the electromagnetic switch 20 to act on the contact II, the three-position four-way valve 22 works in the middle position; when the PLC control system 15 controls the electromagnetic switch 20 to act on the contact III, the three-position four-way valve 22 works at the right position; when repeated torsion tests are carried out; the PLC control system 15 controls the electromagnetic switch 20 to switch back and forth between I and III.
The torsion shaft fatigue testing device provided by the embodiment controls the hydraulic cylinder 11 to drive the torsion shaft 2 to twist through the hydraulic control system 14, and the twisting process is stable and firm.
In other embodiments, the hydraulic control system 14 of the prior art may be employed as long as the hydraulic cylinder 11 can be made to reciprocally drive the torsion shaft 2 to twist.
In some embodiments, the bracket 1 is used for supporting two torsion shafts 2, the two torsion shafts 2 are parallel and symmetrically arranged, the free ends of the hydraulic cylinders 11 are respectively connected with the two torsion shafts 2 through two connecting pieces 9, and the two torsion shafts 2 are symmetrically arranged about the first plane, and the two connecting pieces 9 are also symmetrically arranged about the first plane.
As shown in fig. 3, when the push rod of the hydraulic cylinder 11 is in an initial state, the free end of the push rod is lower than the torsion shaft 2, and an included angle exists between the connecting piece 9 and the vertical direction; the included angle between the connecting line from the shaft collar 7 to the axis of the torsion shaft 2 and the vertical direction is 30 degrees, and the included angle between the connecting piece 9 and the vertical direction is larger than 30 degrees, so that the torsion of the two torsion shafts 2 in the designated direction is ensured.
In the process of extending the push rod of the hydraulic cylinder 11, the included angle between the connecting piece 9 and the vertical direction gradually becomes larger until the connecting piece is in a horizontal state, and the two connecting pieces 9 are hinged to the free ends of the push rod in a structure butt joint mode, so that the effect of mutual offset under the action is achieved, and the service life of the component is guaranteed.
In this embodiment, the two torsion shafts 2 may be twisted at one time, if the two torsion shafts 2 are simultaneously subjected to fatigue test, fatigue lives of the two torsion shafts 2 may be compared, when one of the torsion shafts 2 is twisted off, the hydraulic control system 14 may automatically stop, the twisted off shaft needs to be detached, the hydraulic control system 14 is started to continuously twist the second torsion shaft 2 until the second shaft is twisted off, and the hydraulic control system 14 stops again.
In some embodiments, the torsion shaft fatigue testing device provided in this embodiment further includes a position sensor 10, a pressure sensor 12, and a PLC control system 15, where the position sensor 10 is used to detect a position of a free end of the hydraulic cylinder 11 and transmit the position to the PLC control system 15;
the pressure sensor 12 is used for detecting the oil pressure of a rodless cavity in the hydraulic cylinder 11 and transmitting the oil pressure to the PLC control system 15;
the PLC control system 15 controls the operation of the hydraulic control system 14.
When the position sensor 10 detects that the push rod position is lowered to the set lowest position during the fatigue test, the PLC control system 15 controls the push rod to stop lowering and control the push rod to ascend; when the position sensor 10 detects that the push rod position rises to the set highest position, the PLC control system 15 controls the push rod to stop rising and simultaneously controls the push rod to descend so as to circularly control;
when the pre-torsion is performed, the pre-torsion is started, the push rod rises and drives the torsion end to twist, when the position sensor detects that the push rod moves to the set highest position, the PLC control system 15 controls the push rod to stop rising and keep for a period of time, then controls the push rod to descend, when the push rod descends, the pre-torsion residual angle exists due to the torsion shaft, when the torsion shaft does not reach the initial position, namely, the push rod does not recover to the initial position, at the moment, the oil pressure of the rodless cavity is reduced to 0, and the oil pressure is detected by the pressure sensor, the PLC control system 15 immediately controls the push rod to stop descending and control the push rod to ascend, and the process is repeated until the pre-torsion is completed.
The fatigue life of each shaft is recorded by setting a time timer 17.
The torsion shaft 2 is connected to the bracket 1 in the following manner:
the fixed end of the torsion shaft 2 is sleeved with a first spline housing 19, and the first spline housing 19 is fixed on the bracket 1;
the torsion end is sleeved with a second spline housing 6, and the second spline housing 6 is rotatably arranged on the bracket 1 through a bearing 4; the outer end of the second spline housing 6 extends out of the bearing 4, an extending section is provided with an external spline, a third spline housing 5 is sleeved outside the extending section of the second spline housing 6, a shaft collar 7 is fixedly arranged on one side of the outer wall of the third spline housing 5, and the third spline housing 5 is rotationally connected with a connecting piece 9 through a pin shaft 8 and the shaft collar 7.
The outer walls of the second spline housing 6 and the third spline housing 5 are covered by an end cover 16, and the end cover 16 is fixedly connected with the second spline housing 6 and the third spline housing 5 through a plurality of screws.
In some embodiments, the magnetic field auxiliary device is a magnetic induction coil 3 electromagnetic device, the magnetic induction coil 3 is spirally wound on the outer side of the torsion shaft 2, the magnetic field auxiliary device is used for performing magnetic field control on the torsion shaft 2, a pretwisting process and a load-protecting process are realized under the magnetic field auxiliary effect, stable and rapid plastic deformation can be realized on the surface of the torsion shaft 2 under the magnetic field effect, hysteresis expansion effect occurs, a more stable residual angle is generated, the number of turns of the coil is 50 ten thousand turns through finite element analysis and calculation, when the energizing current is 15A, the magnetic field intensity is 1.0808T, when the energizing current is 42A, the magnetic field intensity is 3.0262T, and constant magnetic field adjustment between 0T and 3T can be realized.
In some embodiments, two support rods 13 are respectively disposed on two sides of the hydraulic cylinder 11, the support rods 13 are located under the connecting pieces 9, the hydraulic cylinder 11 can twist two torsion shafts 2 at a time, or can remove the pin shaft 8 on one of the connecting pieces 9, and the connecting piece 9 with the pin shaft 8 removed is placed on the support rod 13, so that the effect that the hydraulic cylinder 11 twists one torsion shaft 2 alone is achieved.
In some embodiments, the connecting element 9 is a sliding cylinder which is telescopic for the purpose of twisting the torsion end by 30 degrees.
Example two
The embodiment provides a torsion shaft 2 fatigue test method, which adopts the torsion shaft fatigue test device in the first embodiment for testing, and comprises the following steps:
step one, pre-twisting a torsion shaft 2;
the pretwisting process is as follows: when the electromagnetic switch 20 is at the contact position I under the monitoring of the position sensor 10, the push rod is lifted by the rodless cavity of the hydraulic cylinder 11 under the action of the oil pressure P1, one torsion shaft 2 is pre-twisted 30 degrees clockwise, and the other torsion shaft 2 is pre-twisted 30 degrees anticlockwise; then the electromagnetic switch 20 reaches the position of the II contact, and the loading time is kept for 1-2 minutes; finally, the electromagnetic switch 20 reaches the contact position III, the hydraulic cylinder 11 has a rod cavity to enable the push rod to descend under the action of the oil pressure P2, when the pressure sensor 12 is 0-pressure (the pressure sensed by the pressure sensor 12 is the reaction force from the push rod, for the torsion shaft, after pretwisting, the residual angle is larger, the torsion shaft can not rebound to the initial position, in rebound return, the overflow valve of the hydraulic cylinder 11 is always in an overflow state, when the torsion shaft rebounds to enable the push rod to descend, the pressure sensed by the pressure sensor is the pressure when the push rod and the overflow valve jointly act, at the moment, when the torsion shaft rebounds to the residual angle, the rebound is not carried out, the oil leakage is stopped by the overflow valve, the 0-pressure position of the hydraulic cylinder 11 is detected by the pressure sensor 12), the descent is stopped, pretwisting of one period is realized, and then the push rod is controlled to ascend for pretwisting of the following 8-10 periods; the device can pretwist 2 shafts simultaneously, and the pretwisting directions are opposite, so that the generated residual angles are opposite.
Step two, taking down the pre-twisted torsion shaft 2, reinstalling the torsion shaft so that the torsion end of the torsion shaft 2 with the residual angle is placed at a starting position (namely a starting 0 DEG position, and the included angle between the connecting line between the axle collar 7 and the axle center of the torsion shaft 2 and the vertical direction is 30 DEG) and repeating the fatigue test until the torsion is broken;
the torsion shafts 2 are repeatedly twisted between the initial 0 DEG and 30 DEG until the two torsion shafts 2 are fatigued and twisted off during the fatigue test, whether the magnetic field is opened or not can be selected according to the requirement in the fatigue test process, and the magnetic field can be regulated in a constant magnetic field range from 0T to 3T.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. The utility model provides a torsion axle fatigue test device which characterized in that: comprising the following steps:
the support is used for supporting the torsion shaft, two ends of the torsion shaft are respectively a fixed end and a torsion end, the fixed end is fixed on the support, and the torsion end can be rotatably arranged on the support around the axis of the support;
a hydraulic cylinder for providing a torsion torque to the torsion shaft;
the hydraulic control system is used for controlling the hydraulic cylinder to work;
one end of the connecting piece is rotationally connected with the torsion end, the other end of the connecting piece is rotationally connected with the free end of the hydraulic cylinder, and the hydraulic cylinder drives the torsion end to reciprocally twist through the connecting piece;
and a magnetic field assist device capable of hysteresis-stretching the torsion shaft during pre-twisting.
2. The torsion shaft fatigue testing device according to claim 1, wherein: the support is used for supporting the two torsion shafts, the free ends of the hydraulic cylinders are connected with the two torsion shafts through the two connecting pieces respectively, the two torsion shafts are symmetrically arranged about a first plane, and the two connecting pieces are symmetrically arranged about the first plane; when the push rod of the hydraulic cylinder is in an initial state, the free end of the push rod is lower than the torsion shaft, and an included angle exists between the connecting piece and the vertical direction;
in the process of extending the push rod of the hydraulic cylinder, the included angle between the connecting piece and the vertical direction gradually becomes larger until the connecting piece is in a horizontal state, and the two connecting pieces are hinged to the free ends of the push rod in a structure propping connection.
3. The torsion shaft fatigue testing device according to claim 1, wherein: the hydraulic cylinder control system comprises a hydraulic cylinder, a position sensor, a pressure sensor and a PLC control system, wherein the hydraulic cylinder is used for controlling the hydraulic cylinder to move along with the hydraulic cylinder;
the pressure sensor is used for detecting the oil pressure of a rodless cavity in the hydraulic cylinder and transmitting the oil pressure to the PLC control system;
the PLC control system controls the hydraulic control system to work.
4. The torsion shaft fatigue testing device according to claim 1, wherein: the magnetic field auxiliary device is a magnetic induction coil device, and the conductive coil spirally surrounds the outer side of the torsion shaft.
5. The torsion shaft fatigue testing device according to claim 1, wherein: the fixed end is sleeved with a first spline housing, and the first spline housing is fixed on the bracket;
the torsion end is sleeved with a second spline housing, and the second spline housing is rotatably arranged on the bracket through a bearing; the outer end of the second spline housing extends out of the bearing, an extending section of the second spline housing is provided with an external spline, a third spline housing is sleeved outside the extending section of the second spline housing, a shaft collar is fixedly arranged on one side of the outer wall of the third spline housing, and the third spline housing is in rotary connection with the connecting piece through a pin shaft and the shaft collar.
6. The torsion shaft fatigue testing device according to claim 5, wherein: the second spline housing and the third spline housing outer wall cover are provided with end covers, and the end covers are fixedly connected with the second spline housing and the third spline housing through a plurality of screws.
7. The torsion shaft fatigue testing device according to claim 5, wherein: two sides of the hydraulic cylinder are respectively provided with two supporting rods, and the supporting rods are positioned right below the connecting piece.
8. The torsion shaft fatigue testing device according to claim 1, wherein: the hydraulic control system comprises a three-position four-way valve, a directional hydraulic motor and an oil tank, wherein the oil tank is communicated with an oil inlet of the three-position four-way valve through a first pipeline, the directional hydraulic motor is arranged on the first pipeline, an oil return port of the three-position four-way valve is communicated with the oil tank through a second pipeline, and an overflow valve is arranged on the second pipeline; the two oil cylinder oil inlet and outlet ports of the three-position four-way valve are respectively communicated with a rod cavity and a rodless cavity of the hydraulic cylinder through a third pipeline and a fourth pipeline, the fourth pipeline is provided with a one-way valve, the rodless cavity is communicated with an oil tank through a fifth pipeline, the fifth pipeline is provided with a hydraulic control one-way valve, and the hydraulic control one-way valve is communicated with the third pipeline through a control oil way; the fourth pipeline is also communicated with an energy accumulator;
when the three-position four-way valve works at the left position, the directional hydraulic motor is started, the rodless cavity pushes the push rod to move upwards under the pressure action, the one-way valve is opened, and the hydraulic control one-way valve is closed;
when the three-position four-way valve works in the middle position, the directional hydraulic motor is started, hydraulic oil is also injected into the hydraulic cylinder, the energy accumulator plays a role in maintaining pressure, and redundant hydraulic oil flows back to the oil tank through the overflow valve;
when the three-position four-way valve works at the right position, the directional hydraulic motor is started, the rod cavity of the hydraulic cylinder pushes the push rod to move downwards under the action of pressure, the hydraulic control one-way valve is opened, and the one-way valve is closed.
9. The torsion shaft fatigue testing device according to claim 1, wherein: the connecting piece is a sliding cylinder.
10. A torsion shaft fatigue test method is characterized in that: the torsion shaft fatigue testing device according to any one of claims 1 to 9, comprising:
step one, pre-twisting a torsion shaft;
and step two, taking down the pre-twisted torsion shaft, reinstalling the torsion shaft so that the torsion end of the torsion shaft with the residual angle is placed at the initial position, and repeating the fatigue test until the torsion is broken.
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| CN202310664244.9A CN116399577B (en) | 2023-06-07 | 2023-06-07 | Torsion shaft fatigue test device and test method |
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| CN202310664244.9A CN116399577B (en) | 2023-06-07 | 2023-06-07 | Torsion shaft fatigue test device and test method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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